通过MARCH2介导的Lys63结合的多比基因化促进转移,通过调节TGF-β型I受体的催化活性来促进转移
Kun Tae1, Sang Woo Cho1, Seonjeong Lee2
1Department of Biological Sciences, Sungkyunkwan University, Suwon, Republic of Korea.
Cell death & disease
|November 10, 2025
概括
E3泛基因酶MARCH2通过泛基因化增强TGF-β受体ALK5活性,影响细胞迁移和转移. 这一发现揭示了TGF-β信号传递中的新调节机制.
科学领域:
- 分子生物学分子生物学
- 细胞信号传递 细胞信号传递
- 癌症研究 癌症研究
背景情况:
- 转化生长因子-β (TGF-β) 信号通路在细胞过程中至关重要.
- 众所周知,E3泛素酶调节受体降解,但它们在受体催化活性中的作用不太清楚.
研究的目的:
- 调查E3泛素结合酶MARCH2在调节TGF-β型I受体 (ALK5) 催化活性中的作用.
- 探索ALK5泛化对TGF-β信号传递和下游细胞功能,包括转移的影响.
主要方法:
- 使用生物化学测试研究了MARCH2和ALK5之间的相互作用.
- 利用位点定向突变发生法来检查特定氨酸残留物 (K342/343) 在ALK5无处不在和活性中的作用.
- 在细胞和小鼠模型中评估了TGF-β信号传递,细胞迁移和肺转移.
- 分析了癌症基因组图谱 (TCGA) 数据,以查找MARCH2表达和TGF-β向基因之间的相关性.
主要成果:
- MARCH2通过将K63连接的无素链与ALK5在lysines 342/343.3处结合,增强ALK5的催化活性.
- 在K342/343的ALK5突变取消了其催化活性,损害了SMAD2酸化和TGF-β反应.
- 在小鼠模型中,ALK5 K342/343R突变显著减少了肺转移.
- 在TCGA数据中,MARCH2表达与TGF-β标基因表达正相关.
结论:
- 通过MARCH2在K342/343的ALK5无处不在是ALK5催化活性的一个关键调节机制.
- 这种无处不在的事件对TGF-β信号传递,细胞迁移和转移至关重要.
- 通过MARCH2介导的ALK5无所不在是TGF-β相关疾病和癌症的潜在治疗标.
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